stomach hardening

My stepdad has been having problems with his stomach hardening every time he eats. It used to only happen if he ate to much, but now it's every time he eats. His doctors don't seem to know what it is. He does have this condition called Barrett's in his esophagus and he has acid reflux. He is also diabetic. I was just wondering why this area on his stomach would harden every time he eats? No one seems to know so I thought maybe I could ask someone here.

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